支盘桩-地基相互作用及有限元法模拟的研究

支盘桩是一种具有高承载力和低沉降量特性的新型桩。为了探求支盘桩的荷载传递规律 ,本文在静载荷试验的基础上 ,全面系统地研究了支盘桩的承载机理、挤密效应、孔隙水压力消散、荷载传递性状以及有限元模拟结果。通过计算分析表明 :支盘桩在受力上具有摩擦端承桩的特性 ,并且主要靠承力盘承受荷载 ,支盘力约占极限承载力的 60 %以上。根据有限元数值模拟结果 ,指出了盘间存在着应力叠加效应以及最佳盘间距和桩间距。

STUDY ON INTERACTION BETWEEN SQUEEZED BRANCH PILE AND SOIL AND FEM SIMULATION

The squeezed branch pile is a new type one with high bearing capacity and low settlement. Mechanism of bearing, compaction efficiency, pore water pressure dissipation, loading transfer behavior and results of FEM simulation of squeezed branch pile were analyzed systematically based on results of static loading test for exploring load transfer low. It is shown by testing results that squeezed branch pile has specific property of frictional end bearing pile, and bearing load mainly by bearing disks. Force of disks is about 60 percent of ultimate load. Stress superposition efficiency existed between bearing disks and optimal spacing of disks and piles are pointed out according to the varying bound of stress field by means of numerical simulation.